Digital converter boxes receive over-the-air digital TV broadcasts for viewing on TVs that do not have built-in digital tuners. If you wish to keep using your analog TV set, you must purchase a digital converter box. This box receives over-the-air digital TV broadcasts for viewing on a TV that does not have a built-in digital (ATSC) tuner. Additional features include EPG (Electronic Programming Guide), RCA output, antenna RF input (F-type connector), RF output, Closed Caption, and remote control.